Change-speed gearing for power-driven food-mixing machines



Sept. 16, 1930. WRIGHT ET AL 1,775,881

CHANGE SPEED GEARING FOR POWER DRIVEN FOOD MIXING MACHINES Filed Nov. 5. 1927 2 Sheets-Sheet 1 W/T/YfSSES llYVEWTO/PS Sept. 16,1930. F. H. WRIGHT ET Al 1,775,881

CHANGE SPEED GEARING FOR POWER DRIVEN FOOD KIXING MACHINES Filed Nov. 5. 1927 2 Sheets-Sheet 2 FIG 5 Fla-4 Patented Sept. 16, 1930 ,UNI'TE'D STAiT FREDERICK HURSH WRIGHT; OF LONZDON, ANiD EDMUND WOODWARD LEWIS; OF

'LEISTON; ENGLAND CHAN GE-SPEE'D GEARING FOR POWER-DRIVEN FOOD-MIXING- MACHINES Application filed Novemb er 5,,l9 2'f, SeriaLNo. 231,321, and in Great BritainN ovember 12, 1926.

This .invent ion relates to change-speed gciaring for power-driven food-mixing machines; 'Thevgearingis .of the type in which changes are effected bythe lateral .movement of,constant-mesh .gears mounted on parallelshafts, oneset of gearwheels on one/ shaft f being v loose and provided a with clutch faces which engage with lugs or dogs on said shaft; and the controlis of thetype in which a single hand lever is employed to diseonnect the main clutch and ngag ar,

Referring to the. accompanying drawings:

Fig l represents a sectional elevation of the invention as applied.,to a four-speeds han e. se r Fig. 2 shows aface view. ofthe gate.

Fig i'l shows an, elevation of the upper a liding-s nar o al e scale. Fig. his aside viewof Fig. 3, Fig aisa plan of Fig. 3. a Rig. 6 is a sectional elevation on the plane 5 5, Fi .5.

"2 5 -The gears and main clutch are housed in a singlebo A abovethe revolving headB which carries the usual beater shaft .C.

Two parallel shafts 1, 2, carry respectively the gear wheels 3*, 4 5", 6 and 3, 4, 5, 6,

preferably spiral gears, those on the shaft 1 being-,fixedthereto, and .those on the shaft 2 being ;loose and slidable thereon. In addi-,

tion, theshaft 1 has fixed thereto a clutch plate 7 forming part-of a main driving clutch whichvreceives power from a motor or other source v The drawing shows a worm wheel 8 as-the part of the clutch to which power is .applie The shaft 2 hasrigidlyanounted thereon twodog. clutches 9 and 10 one between each pairof loose wheels. Any one of the four loosewheels can be engaged with the respectivedgg clutch9 or 10; the drawing shows the loose. wheel accruing into engagement withthe clutch 10, to couple the shaft lto shaft 2 through the fast and loose wheels 5?. and 5.

This coupling -of the dog clutches 9 and 10 I and loose wheels, is effected by sliding collars.12, pivoted levers or striking forks to turn a. carrying selective cams .for chang v 11, and cams 13; The levers ll engage at .the cams 13. The cams are mounted on a" rotatable shaft ltwhich is turned to th'e desired extent by a pinion 15 and sector 16.

The sector 16 is actuated by the main control lever 17 which can turn on a pivot 18 mounted on cheeks or flanges 19 on a slotted rotatable stud 20, the lower end of which is a solidpivot carrying the sector 16.

To prevent damage to the gearsthrougli the dog clutches 9, 10, not being in the exact position to enter into engagement smoothly with the loosewheels, the" sliding collars l2 are made as three superposed rings sur: rounding the dog clutches and yieldingly connected together by springs- The central part 12, Figs} to 6, is a ring of sufficient thickness to prevent the gear wheels-from engaging the dog clutches while in amid. position, and has two diametrically opposite trunnions 11 for pins on the forked end of tlie lever ll.v The two outer ring portions 12, 12? areattached to the central part 12- by springs :12 and bolts 12 which tend to keep each pair ofgear wheels close to the central part.

The bolts12 area loose fitin lugs 12, 12*, Figs 3 to6, which project in pairs from the curved face h of the ring 12, the pair 12F beingat the upper part and the pair 12$ at the lower part. The ring portions 12*, 12: similarly have lugs. 12 12 in which the bolts 12 are. screwegh and the ring portions are each, shouldered inside to engage flanges. 12 129- on bushes12, 12. which are keyed to the loose wheels 3, 4 respectively. Each ring portion may. consist of two flat rings as shown in Fig. 6,:andthe bushes 12 12. may be -provided with liners as shown in Figs-.;1-and 6. Each collar 12 as a whole can therefore; slide longitudinally but is prevented from rotating by the forks and trunnions.

Referring to. Figs. land 6, if the central ring 12 is depressed by the lever 11 it will, push the loose gear wheel 4: downwards away ,fromthe deg clutchQ, and ,will pull the loose gear wheel 3 also downwards and tend 7 ing to engage the dogs 3 with the clutch 9. If the relativepositions of dogs 3 and clutch 9 are unfavourable for smooth engagement, the springs unfavourable position is passed, the pres: sure of; the spr ngs en u es: e ga me t of dogs and clutch, which is further facilitated by the spiral shape of the teeth.

collar, l2operated thereby shifts one ofv the.

' moved horizontally Simi1ar1y,*if1theicentral ring-112 is lifted, it'will push the loose wheel 3 upwards away from the clutchfijand will 'pull th-eloose' wheel cupwards and tending to engagethe. 9, the-springs :12? yielding and tne" r ngs 12 12 separating dogs P with, the 'clutjch if the pos tion is unfavourable for engage;

ment;

T e 'h i mOv,eiiient of the control? lever 1-7 turns the sector 16 and pinion "15.

The vertical movement of thelever on its p vo T e f t e a m n 1 eeement of thermain'clutch by means of a slidshortlshaftff e, the shaft Zec'an turn in a bearing 25fand is, slotted at the other end tori-receive an arm flb1QpQrtion-28 of thejmain clutch.

other of the slotsforming a, pin j211'is provided with a ball 21 out? of the gate 30' by a.

downward motion,

7 thus turning the shaft :24 I and diseonne'cting' the; main clutchf'T. Then the lever 17 is till it-is oppositea fresh gate slotcorresponding to theidesired gear,

thus turning the loam shaft 14g the required.

b h corr spondingcam 1s 'il fi ii ct on I and tilt one of the levers 11 the loose wheels into engagement withitstcorresponding dog clutch, while th e coinpanion wheelio'f the 'pair' is shifted away from" the clutch Finally," the lever-17 is moved into clutch. v. i

:,As 1 the vertical movement of the lever 17 aidpfresh slot, thus, re-engaging the main 1 i'sicomparativelysmall, the selector gate may befmade with short partitions separating the slots,- and the lower ends] of the. partitions are preferably roundedaslshown in Fig. 2, so that the lever 17, may glide easily p from one slotvto another.

* Having thus. "described our invention, what: weclaim as new anddesireto secure byqLear Paten'tis V,

;,-1. A, ch;ange speed ,gearing including a driving: shaft, a series of gears fixedthere-i I 12 yield and the, rings 12%, 12 separateand permit the lever ll to assume its correct position, assoon as the gear-of the pair,

element on 'ingpin- 21 and anjarm 23 .onone endfo'f' a on, a driven shaft, a series of gears mounted for sliding and free rotation on the driven shaft, the gears of the driving and driven shafts bein'gin constant mesh, a toothed clutchingelement fixed onthe driven shaft between each pairof gears thereon, a 'c'oop-, erating toothed clutching element "on each means for connecting each ra f;sea s. ee t -"t ri Sel l -59 eratingeacli pair of gears t t'mise one gear of a pair to move toward the clutching the shaft kwhiilezrtheiaother g of the pair is moved'away from suchclutohing' element, the connecting f'ine an's :het'vveen each pair of gears being yieldable' to permit relative movement between the; gears'of a pair in thee vent'theclutching elements an shaft and onthe gear tobe connectedtherewith are out of; registry. g

2. A change speed; gearing includingf'a drivingfshaft, a series of gears, fiiied there p for: sliding: and free rotation on the dri en sh ft, the] gears fthe d riviiiglfan d driven shafts being' in constant fmeshf toothed clutching element fixed on the driven shaft a drivenshaft, a ser es of gears mounted between each-pairof'gears thereon, a coopra n t d clu c i emee I JBe gear of the .pair, means for connecting Leach palr of gears, and means 'fors'electively:op;

erating e a I ach pair of. gears t'ofcause' one gear of a pair to move toward tliefclutehing" element onthe shaft while the othe'r gear of the pair is moved; away from such cliitoly ing element, theflconne cting I means "between each pair of gears being yieldablejtoip'rmit',

relative movement j between: (the g .Tfd fi shaft andon the gearto be connected there-'- with-ar-e out of registry, sai'diconnecting means compelling clutchingcooperation be tween' th'e selected ,gge'ar and shaft carried clutching elements when' clutching 'elements'arein regi'stry. Y

f 3; change speed? a driving shares pair of gears*fixedthereon,-v

pair in the event'theclutchingelements"onthe a driven shaft,.a pairofgearsjmounted on f the driven'shaft for independentsliding and;

IQi321t1V61 movement, the 'gear sf on the driv ing' shaft and on the dri'ven' 'shaft being ii I continuous Lm'esh, collar arranged inter mediate the gears'of the driven shaft, a

the gear in the movement "of the ring,' :yield iis a-rranged at each end of theQcolla'riand fco; operating wit'hthe'adjac'ent gearto fmove able connect onsbetween therespective rings 7 to causefthe gears to be simultaneously moved in the movementof thenngs',"manualrmeans'for, operatingthe collar'to cause the. respective ringspto move therewith, a toothed "clutch mediatethegears, and a cooperating'toothed clutch element'on' eachi of thejgearsifthe movement of, the: collar sewin 0 move the I clutch element on one gear into cooperati'on element "on the shaftinter with the clutch element on the shaft and the clutch element on the other gear out of cooperation with the clutch element on the shaft, the yielding means connecting the rings permitting interrupt-ion of the movement of the gear to be brought into clutching cooperation with the shaft in the event the teeth of the clutches are out of clutching registry without interfering with the move ment of the collar and thereafter causing clutching cooperation of the parts immediately following proper clutching registry of the teeth.

In testimony whereof we have signed our names to this specification in London, England, this 18th day of October, 1927.

FREDERICK HURS'H WRIGHT. EDMUND l/VOODl/VARD LEWIS. 

